[amsat-bb] Re: Diplexer

Nigel Gunn G8IFF/W8IFF nigel at ngunn.net
Sat Apr 9 08:30:13 PDT 2011

And its diplexer and duplexer.

On 09-Apr-11 15:15, Anthony Monteiro wrote:
> Dear Friends,
> Perhaps this will help clear up the confusion.
> A "diplexor" is a passive device that lets you split
> and/or combine signals based on their frequencies.
> It does not matter whether the frequencies are close
> together or on different bands nor does it matter if
> you are using it for transmitting or receiving.
> A diplexor is commonly used in radio and TV broadcasting
> to allow two transmitters on different frequencies
> to share the same antenna.
> A "duplexor" is a device that allows both transmitting and
> receiving over the same transmission line or antenna. It
> may or may not be a passive device and it may or may not
> be frequency selective.
> In WWII RADAR systems, a duplexor was used to allow
> the transmitter and receiver on the same frequency to
> share the same antenna. The duplexor was a waveguide
> device that had special gas-filled tubes to quickly
> switch the signal direction.
> A typical ham radio cavity duplexor is used in FM repeater
> stations to allow the transmitter and receiver to share
> the same antenna. Since it is a passive frequency-based
> multiplexor, it is also a diplexor.
> If you used the exact same device to instead connect
> two transmitters to the same antenna, it would no longer
> be a duplexor but it would still be a diplexor.
> 73,
> Tony AA2TX
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Nigel A. Gunn,  1865 El Camino Drive, Xenia, OH 45385-1115, USA.  tel +1 937 825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF 9H3GN),  e-mail nigel at ngunn.net       www  http://www.ngunn.net
Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pigs QRP Club International #385,
            Dayton ARA #2128, AMSAT-NA LM-1691,  AMSAT-UK 0182, MKARS,  ALC, GCARES, XWARN, EAA382.

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